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Nomenclature of the tourmaline-supergroup minerals
Abstract A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY3Z6(T6O18)(BO3)3V3W, where the most common ions (or
The Crystal Chemistry of Sulfate Minerals
Sulfur is the fifteenth most abundant element in the continental crust of the Earth (260 ppm), and the sixth most abundant element in seawater (885 ppm). Sulfur (atomic number 16) has the
The crystal chemistry of hexavalent uranium; polyhedron geometries, bond-valence parameters, and polymerization of polyhedra
The geomeffy, bond valences, and polymerization ofhexavalent uranium polyhedra from 105 well-refined structures are analyzed. The Utu cation is almost always present in crystal stnrctures as part of
Classification of the minerals of the tourmaline group
A systematic classification of the tourmaline-group minerals, general formula X Y3 Z6 (Γ6Oi8) (B03)3 V3W, is proposed, based on chemical composition and ordering at the different crystallographic
Nomenclature of the amphibole supergroup
A new classification and nomenclature scheme for the amphibole-supergroup minerals is described, based on the general formula AB 2 C 5 T 8 O 22 W 2 , where A = □, Na, K, Ca, Pb, Li; B = Na, Ca, Mn 2+
Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen
  • O. Gagné, F. Hawthorne
  • Chemistry, Medicine
    Acta crystallographica Section B, Structural…
  • 30 September 2015
Published bond-valence parameters for cation–oxygen bonds are evaluated with regard to their agreement with the valence-sum rule, and new bond-valence parameters are derived for 135 cations bonded to
Nomenclature of amphiboles: additions and revisions to the International Mineralogical Associations amphibole nomenclature
Abstract The introduction of a fifth amphibole group, the Na-Ca-Mg-Fe-Mn-Li group, defined by 0.50 < B(Mg,Fe2+,Mn2+,Li) < 1.50 and 0.50 ≤ B(Ca,Na) ≤ 1.50 a.f.p.u. (atoms per formula unit), with
The Crystal Chemistry of the Phosphate Minerals
Phosphorus was discovered in 1669 by Hennig Brand. The word phosphorus originates from the two Greek words phos , meaning light, and phoros , meaning bearer, due to the phosphorescent nature of white
Detection and discrimination of sulfate minerals using reflectance spectroscopy
Abstract A suite of sulfate minerals were characterized spectrally, compositionally, and structurally in order to develop spectral reflectance–compositional–structural relations for this group of
The crystal chemistry of Si Al substitution in tourmaline
Thestructuresof ninegem-qualitycrystalsof V-bearing vite,a=15.95,c=7.17 A y= 1530 43,R3*,havebeenrefined to R indices of. -227o using graphite-monochromated MoKcl X-radiation; the crystals used for
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